/Engine/Plugins/Runtime/MeshModelingToolset/Source/MeshModelingTools/Public/EditMeshPolygonsTool.h
Simplify every polygon group by removing vertices on shared straight edges and retriangulating
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=ShapeEdits, Meta=(DisplayName="SimplifyByGroups", DisplayPriority=15)) void SimplifyByGroups()